To meet the requirements of the detection system of underwater controller of subsea tree, this paper adopts the data acquisition and control mode of “HMI+ SIEMENS PLC+SQL ".Using the configuration software, completed the development and design of production tree detection system to monitor, control and data communication. The monitoring function has realized the process simulation of oil tree, the control function has realized the remote control of oil tree, and database SQL has realized the management and analysis of data in oil well, achieving real-time tracking, rapid response, improve speed , quality and reporting level of oil production engineering design .At the same time the design center can make full use of the database to complete the design of required query, statistical analysis and the output function of related form .

1. International Journal of Computer Science & Engineering Survey (IJCSES) Vol.5, No.5/6, December 2014
DOI:10.5121/ijcses.2014.5601 1
DETECTION SYSTEM DESIGN OF SUBSEA TREE
CONTROLLER
Xie Yang and Cheng Wushan
College of Mechanical Engineering, Shanghai University of Engineering Science,
Shanghai 201620, China
ABSTRACT
To meet the requirements of the detection system of underwater controller of subsea tree, this paper adopts
the data acquisition and control mode of “HMI+ SIEMENS PLC+SQL ".Using the configuration software,
completed the development and design of production tree detection system to monitor, control and data
communication. The monitoring function has realized the process simulation of oil tree, the control
function has realized the remote control of oil tree, and database SQL has realized the management and
analysis of data in oil well, achieving real-time tracking, rapid response, improve speed , quality and
reporting level of oil production engineering design .At the same time the design center can make full use
of the database to complete the design of required query, statistical analysis and the output function of
related form .
KEYWORDS
Subsea Tree, Underwater Controller, Detection System, HMI, SQL.
1. INTRODUCTION
Subsea production systems as the most central part of deep water oilfield, how to develop a
reasonable test requirements and test methods to ensure their effectiveness, safety and reliability
features in the process of work, is one of the key technologies of deep-sea oil and gas field
development. Subsea production system consists of a master station, hydraulic power station,
umbilical, umbilical distribution unit, subsea trees, manifolds, underwater jumper, subsea control
systems and other components, and each subsystem contains a variety of cell components.
Therefore, the test needs subsea production systems, including basic unit testing, subsystem
factory acceptance testing, system integration testing on-site acceptance testing and
commissioning etc. [1]
.
2. SYSTEM COMPONENTS AND PROCESSES
Subsea tree is mainly used for the control of wellhead pressure and flow during the production of
oil wells, while taking into account a variety of test and implement of oil production measures,
therefore, its safety must be fully guaranteed. Because of subsea tree placed in the deep for long,
the important and effective means of plant safety evaluation for subsea tree is on the testing of
underwater controller of subsea tree, among them, the communication between the underwater
controller and subsea tree is shown in Figure 1. In order to ensure that the entire detection system
is safe and reliable operation, the system will employ configuration design combining monitoring
and control functions [2]
.

2. International Journal of Computer Science & Engineering Survey (IJCSES) Vol.5, No.5/6, December 2014
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Figure 1. Schematic of underwater communication controller
Subsea tree is responsible for the main circuit work throughout the oil and gas exploration,
production flow can be adjusted to control the total production. Annulus circuit is mainly used for
the discharge of down hole leaked oil and gas of subsea tree, under normal circumstances, this
circuit is in a standby state .When the subsea tree work, annulus loop pipeline valve is normally
closed, it is controlled by underwater electro-hydraulic valve of SCM to drive the valve open.
When the casing and tubing leaks, down hole pressure sensor will transmit the measured data
back to the SCM, SCM then transmits the signal to the master station MCS, after analyze and
treatment of MCS, if found pressure exceeds a certain value, MCS will issue control instructions
to the SCM, SCM opens the annulus main valve.
Chemical injection circuit is divided into three parts: the scale inhibitor, ethylene glycol and
methanol injection circuit. Chemicals is from the water platform, ground electro-hydraulic
distributor TUTA will transfer chemicals to the underwater electro-hydraulic distributor SUTU
through the umbilical, underwater electro-hydraulic distributor then injects different chemicals
into the wellbore submarine pipeline or pipeline of subsea tree , different chemicals play a role in
cleaning, freezing and wax.
SCM will upload the injection metering valve data to MCS, after the processing and analysis of
the data, less than the set value, MCS will increase in traffic of platform chemicals; greater than
the set value, MCS will reduce in flow of platform chemicals. Inhibitor is injected to the bottom
of the subsea tree through an underwater electro-hydraulic distributor, SCM acquires the data of
inhibitor injection metering valve to control the chemical injection valves open and close, playing
a role in cleaning. Ethylene glycol is injected to the main loop of subsea tree through an
underwater electro-hydraulic distributor, SCM collects the data of glycol injection metering valve
to control the chemical injection valves open and close, to play the role of antifreeze. Methanol is
injected directly into the main circuit by underwater electro-hydraulic distributor, in the absence
of a metering valve, methanol loop has been in a normally open state, playing the role of wax.
Schematic in Figure 2.

3. International Journal of Computer Science & Engineering Survey (IJCSES) Vol.5, No.5/6, December 2014
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Figure 2. Map production principle of subsea tree
3. MONITORING SYSTEM DESIGN
3.1. Monitoring System
The design of monitoring system of underwater controller of subsea tree contains determining
engineering framework, graphics production interface, process control, storage capabilities and
security mechanisms. The structure of monitoring system is shown in Figure 3.
Figure 3. The structure of monitoring system

4. International Journal of Computer Science & Engineering Survey (IJCSES) Vol.5, No.5/6, December 2014
4
3.2. Monitoring Software Design
The detection system of underwater controller includes control panel, underwater controller, the
main loop, the annulus loop, pharmacy loop, alarm unit and report printing. This test system has
the following features:
(1)Achieving the simulation of production processes: the interface design of the controller under
water makes the working flow of the subsea tree can be seen intuitively, which includes main
loop, annular loop, glycol circuit, scale inhibitor and methanol loop circuit. Using the
configuration system to develop a dynamic extraction process of display interface, which is
capable of real-time simulation of a whole process flow, simultaneously, convenient for field
personnel to operate;
(2)The standardization of screen design, the modular of functional planning: pictures are based on
ergonomic principles and working long hours to minimize fatigue. Function module designs
logically, to minimize duplication operation, misuse and other invalid operation. To monitor
whether the excessive amount of critical, real-time alarm or reminder in this design by the alarm
unit of configuration software, the valve work range of 5%~95%, less than 5% for the lower limit
alarm, higher than 95% for the upper limit alarm, the alarm limit data for 80% of range.
(3)SQL database query: through the connection of configuration software and SQL database, the
interface can display information of database, different time, date and the amount of collected
information corresponding to different interface. The definition of dynamic data link in the
development of configuration software system makes the picture and display the data in the
operating environment can be updated in real time with the change of the data.
(4)Monitoring interface is shown in Figure 4.
Figure 4. Monitoring interface
3.3. Control Software Design
Using computer monitoring software combined with PLC by connecting the control buttons and
the variables of PLC to achieve the control of the system:
(1)In the configuration software design of the control panel, different colors to distinguish
the different control states;
(2)Programming for the designed control button achieves the aim of controlling;

5. International Journal of Computer Science & Engineering Survey (IJCSES) Vol.5, No.5/6, December 2014
5
(3)Display box shows the variable amount which is connected to the amount defined in
configuration software, trend display controls added configuration variables;
(4)PLC has two kinds of programming model: automatic and manual control. During
automatic operation, the main circuit of the regulating valve is opened slowly. Interface appears
water flow when opening >13%, the opening value greater the flow more quickly and more
broadly. When opening value reach 95%, ethylene glycol regulating valve, scale
inhibitor regulating valve and the on-off valve open at the same time, also, the opening degree of
the regulating valve > 13% interface appears water flow, and the opening value greater
the flow more quickly and more broadly. When ethylene glycol regulating valve and the scale
inhibitor regulating valve is opened and the value reach to 95%, the main loop water pump,
methanol pump, ethylene glycol pump ， inhibitor pump open， and system is in normal
operation conditions. If you want to switch to manual mode, first click the stop automatic mode,
and then click manual control, specific control process in Figure 5.
Figure 5. The flow chart of control mode
4. COMMUNICATION DESIGN
There are two kinds of communication mode in this design: communication between
configuration software and database, configuration software and PLC. Through the connection

6. International Journal of Computer Science & Engineering Survey (IJCSES) Vol.5, No.5/6, December 2014
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configuration software and database of SQL, configuration software will read directly data
gathered by the sensor to the database.
4.1 Communication between software and database configuration
(1) The definition of variables
To achieve the connections between configuration software and database, connections between
the variables in the data dictionary of configuration software have been already established, such
as, the establishment of Device ID, the main circuit of the variable temperature, the main circuit
pressure, the flow of main loop, the temperature of annulus loop, pressure, flow, scale inhibitor
for ethylene glycol flow of these eight variables. Where Device ID is the memory integer, the rest
is I/O real.
(2) Create a form template E # table, as shown in Table 1.
Table 1. Template form
Variable name Variable types Variable length
Date Fixed-length string 50
Time Fixed-length string 50
Main circuit temperature Float 1
Primary circuit pressure Float 1
Main loop flow Float 1
Annulus circuit temperature Float 1
Annulus circuit pressure Float 1
Glycol flow Float 1
Inhibitor flow Float 1
(3) Create a record body bind5, as shown in Table 2.
Table 2. Records body form
Field Name Variable name
Date Site $ Date
Time Site $ Time
Main circuit temperature Site main circuit temperature
Primary circuit pressure Site primary circuit pressure
Main loop flow Site main loop flow
Annulus circuit temperature Site annulus circuit temperature
Annulus circuit pressure Site annulus circuit pressure
Glycol flow Site glycol flow
Inhibitor flow Site inhibitor traffic
(4) Establishment of a database and set up an ODBC data source.
Select the ODBC data source management tool in the control panel, on the users tab, click the
Add button, select SQL database, after the completion of filling in the mine data source
name, press the select button to select the created database SQL.
(5)Data Command Language Programming
Database connection: SQL Create Table (Device ID, "E# table", "E# table");

7. International Journal of Computer Science & Engineering Survey (IJCSES) Vol.5, No.5/6, December 2014
7
Create a database table: SQL Insert (Device ID, "E# table", "bind5");
Disconnect the database: SQL Disconnect (Device ID);
4.2 Communications software and PLC configuration
Communication of IPC and PLC: using PPI communication of SIEMENS PLC series S7-
200 configuration software. 9600 baud rate, 1 check bit, data bit 8, stop bit 1, RS232, COM1
serial communication mode , the device address 2, the rest is set to the default parameter.
5 TEST RESULTS
Underwater production tree controller detection after the preparations, restart your computer,
double-click the desktop icon into the monitoring software of monitoring software main interface,
can process according to click on the corresponding button on the control of each device detecting
and controlling water under manual control at any time can be observed on the equipment
operation; operation and test data in the monitoring interface, if the manual control state switches
to automatic operation state, the system will enter the PLC programmed automatic process
running [7]
, reading from the database data. As shown in Table 3, data from the test verifies the
design reliability and stability.
Table 3 Test results
Date Time
Main
circuit
temper
ature
/℃
Primary
circuit
pressur
e /MPA
Annulu
s circuit
tempera
ture /℃
Annulus
circuit
pressure
/MPA
Main
loop
flow /(m
³/h)
Inhibitor
flow (m
³/h)
Glycol
flow
(m³/h)
2014-5-
30
04:49:
04
32.492
187
0.03382
8
32.8828
12 0.001992
5.40781
3
0.77937
5
0.8243
75
2014-5-
30
04:49:
05
32.496
093
0.02011
7
32.8828
12 0.001992
5.41015
6
0.77937
5
0.8246
87
2014-5-
30
04:49:
06
32.496
093
0.02097
7
32.8867
2 0.001992
5.39765
6
0.77906
3
0.8243
75
2014-5-
30
04:49:
07 32.5
0.02136
7
32.8867
2 0.001953
5.40859
4
0.77781
2
0.8231
25
2014-5-
30
04:49:
08 32.5
0.02121
1
32.8906
25 0.001992
5.40312
5
0.77937
5
0.8243
75
2014-5-
30
04:49:
09 32.5
0.02105
5
32.8906
25 0.001992
5.40781
3
0.77843
7 0.825
2014-5-
30
04:49:
10
32.503
906
0.02121
1
32.8945
3 0.001953
5.40468
7
0.78093
7
0.8240
63
2014-5-
30
04:49:
11
32.503
906
0.02109
4
32.8945
3 0.001992
5.39687
5
0.78187
5
0.8253
12
2014-5-
30
04:49:
12
32.507
812
0.02121
1
32.9023
43 0.002031
5.40859
4
0.77937
5
0.8256
25
6. CONCLUSIONS
The development of oil resources of marine is a research and development strategic plan in the
current stage, in order to ensure the safe operation of the equipment of oil and gas resources

8. International Journal of Computer Science & Engineering Survey (IJCSES) Vol.5, No.5/6, December 2014
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development in deep waters, the concrete research about detection system for underwater
controller in this paper obtained the following conclusions [8-10]
:
(1)According to the production facilities of monitoring system of water under the functional
requirements, the interface of monitoring system based on configuration software is designed,
users can more intuitively and accurately operated underwater production facilities.
(2)Underwater production tree controller detection system experiments proved that the stability,
accuracy and safety of the monitoring system in the data acquisition, process control and other
aspects. Development and application of the controller detection and monitoring system of subsea
tree provide an effective method for automatic control of various mechanical equipment, test
equipment and process flow. This data acquisition and control method mainly includes the
following technical features: configuration software programming is flexible, convenient, and the
configuration interface design provides a vivid image, the same time, with fast computer data
storage and processing, and growing large capacity function; PLC data acquisition and control
have favour performance in reliability, and the compatibility of communication with computer.
Combining effectively these advantages of technology together to develop a variety of reliable
data acquisition and control systems.
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in the Underwater Production System[J], Automation in Petro-Chemical Industry, No.5, pp29-31.
[2] Jia Guangzheng,Li Mangtian, Wang Jinyou, Zhang Shujin,(2009) Monitor and Control System of
Hydrostatic Testing for Christmas Tree Equipment[J], Machinery & Electronics, No.4, pp40-42.
[3] Tang Yan, Lin Jingdong, Qu Yingying,(2010)Statistical Data Report Based on SQL Access Functions
of Kingview[J], Journal of Jiamusi University (Natural Science Edition), No.3, pp346-348.
[4] Tang Mingmei, Tang Xiaorong,(2014) Design of Production Process Database System Based on PLC
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Author
Corresponding author: Xie Yang (1990-), male, master of engineering, research direction
for robotics and intelligent control.